And what the missionaries would do is, they'd walk around and they'd pick up hyena shit.

This method also has drawbacks, as scavengers such as hyenas are capable of infiltrating almost any exclosure.

When our ancestors moved out of the African forest onto the savannah more than a million years ago, they rapidly became effective predators. Sharing prey with pre existing carnivores, they acquired tapeworms that originally inhabited only hyenas, large cats, and African hunting dogs.